Note: To view multiple endings based on the "final choice," you will be allowed to restart the last stretch of the final level after watching an ending. However, if you play multiplayer or the iOS game Mass Effect Infiltrator to boost your Effective Military Strength rating to access additional endings, you will need to restart from the final attack on the enemy base for your boosted score to take effect. See this post (warning: some spoilers) for more details.

Below is a chart that describes the ending cutscene that will you will see based on the choices you make in the game. Note that the Effective Military Strength values will slightly vary depending on your decision to save or destroy the Collector Base in Mass Effect 2. (Add 300 points to each tier if you imported a save with the Collector Base intact. [Note that saving the Collector Base gives you an extra 100 EMS, so you really only have to earn 200 extra EMS.] The game assumes that you destroyed the base if you do not import a save.)